Allentown
Pennsylvania, USA
Long-term weather forecast
Long-term weather forecast

January weather forecast and climate
Allentown, PA

An aerial view of the vast city of Allentown in Pennsylvania, on a hot, sunny day, with the partly cloudy sky and a far view of a clear horizon line
An aerial view of the vast city of Allentown in Pennsylvania, on a hot, sunny day, with the partly cloudy sky and a far view of a clear horizon line
January, like December, in Allentown, Pennsylvania, is another cold winter month, with temperature in the range of an average high of 36°F (2.2°C) and an average low of 19.6°F (-6.9°C).

Temperature

The coldest month is January, with an average high-temperature of 36°F (2.2°C) and an average low-temperature of 19.6°F (-6.9°C).

Humidity

In January, the average relative humidity is 69.1%.

Rainfall

In Allentown, during January, the rain falls for 11.1 days and regularly aggregates up to 3" (77mm) of precipitation. In Allentown, Pennsylvania, during the entire year, the rain falls for 126.8 days and collects up to 45.4" (1151.9mm) of precipitation.

Snowfall

January through April, November and December are months with snowfall in Allentown.

Daylight

In Allentown, Pennsylvania, the average length of the day is 9.7h.

Sunshine

The average sunshine in January is 5h.

UV index

In Allentown, the average daily maximum UV index in January is 2. A UV Index estimate of 2, and below, represents a low threat to health from unprotected exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 2 transform into the following instructions:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the coldest month in Allentown?

With an average high-temperature of 36°F (2.2°C) and an average low-temperature of 19.6°F (-6.9°C), January is the coldest month in Allentown, Pennsylvania.

What is the temperature in January in Allentown?

In Allentown, in January, the average high-temperature is 36°F (2.2°C), and the average low-temperature is 19.6°F (-6.9°C).

What is the average humidity in January in Allentown?

In Allentown, Pennsylvania, the average relative humidity in January is 69.1%.

How much does it rain in Allentown in January?

In Allentown, Pennsylvania, in January, during 11.1 rainfall days, 3" (77mm) of precipitation is typically accumulated.

How many days does it snow in January in Allentown?

In Allentown, Pennsylvania, during January, snow falls for 5.6 days and regularly aggregates up to 10" (254mm) of snow.

How many hours of daylight does Allentown have in January?

The average length of the day in January in Allentown is 9.7h.

How long on average sun shines in January in Allentown?

In January, the average sunshine in Allentown is 5h.

What is the UV index reading in January in Allentown?

In Allentown, the average daily maximum UV index in January is 2. A UV Index value of 2, and less, symbolizes a minimal hazard to health from the exposure to the Sun's UV radiation.
Average temperature in January - Allentown, PA
  • Average high temperature in January: 36°F

The warmest month (with the highest average high temperature) is July (84.2°F).
The month with the lowest average high temperature is January (36°F).

  • Average low temperature in January: 19.5°F

The month with the highest average low temperature is July (62.7°F).
The coldest month (with the lowest average low temperature) is January (19.5°F).

Average humidity in January - Allentown, PA
  • Average humidity in January: 69.1%

The month with the highest relative humidity is September (74%).
The month with the lowest relative humidity is April (60.9%).

Average rainfall in January - Allentown, PA
  • Average rainfall in January: 3"

The wettest month (with the highest rainfall) is July (5").
The driest month (with the lowest rainfall) is February (2.7").

Average rainfall days in January - Allentown, PA
  • Average rainfall days in January: 11.1 days

Months with the highest number of rainy days are April and May (12.1 days).
Months with the lowest number of rainy days are September and October (9.1 days).

Average snowfall in January - Allentown, PA
  • Average snowfall in January: 10"

The month with the highest snowfall is February (11.1").
Months with the lowest snowfall are May, June, July, August, September and October (0").

Average snowfall days in January - Allentown, PA
  • Average snowfall days in January: 5.6 days

The month with the highest number of snowfall days is January (5.6 days).
Months with the lowest number of snowfall days are May, June, July, August, September and October (0 days).

Average daylight in January / Average sunshine in January - Allentown, PA
  • Average daylight in January: 9.7h

The month with the longest days is June (Average daylight: 15h).
The month with shortest days is December (Average daylight: 9.3h).

  • Average sunshine in January: 5h

Months with most sunshine are June and July (Average sunshine: 9h).
Months with least sunshine are November and December (Average sunshine: 4).

Average UV index in January - Allentown, PA
  • Average UV index in January: 2

Months with the highest UV index are June and July (UV index 9).
The month with the lowest UV index is December (UV index 1).